Sold Flat

FLAT 78

15 PORTMAN SQUARE, LONDON, GREATER LONDON W1H 6LL

1 beds 667 sq ft Listed 5 Jan 2009 (-6370d)

£525,000

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# 1 bedroom apartment for sale (W1H 6LL)

## Property Details

| Key | Value |
|-----|-------|
| Address | FLAT 78, 15 PORTMAN SQUARE, LONDON, GREATER LONDON W1H 6LL |
| Price | £525,000 |
| Bedrooms | 1 |
| Construction age | England and Wales: before 1900 |
| Floor area | 62 m² |
| Last sold | £600,000 Feb 2010 |

## EPC Rating & Upgrade Cost

- **Current rating:** B
- **Potential rating:** B
- **Expiry date:** 25/06/2034
- **Est. upgrade cost to C:** £9,100

### Recommendations
- Q (£4,000 - £14,000)
- D (£80 - £120)

[View full EPC on gov.uk](https://find-energy-certificate.service.gov.uk/energy-certificate/2213-9311-2261-7710-1199)

## Description

An extremely well presented spacious one bedroom apartment available to buy in a sought after portered building. The flat is approx 680 sq feet and has scope to create a secong bedroom. Portman Square is ideally located in the Heart of the West End residents benefit from access to the Square gardens and use of the tennis court.

## Property Photos

- ![Photo](/listings/photos/24278195/513724)

## Sales History

*Recorded sales for this property. Data from Land Registry Price Paid.*

| Address | Price | Date | Type |
|---------|-------|------|------|
| 15 FLAT 78 PORTMAN SQUARE, LONDON, CITY OF WESTMINSTER, GREATER LONDON, W1H 6LL | £600,000 | 23/02/2010 | Flat |
| 15 FLAT 78 PORTMAN SQUARE, LONDON, CITY OF WESTMINSTER, GREATER LONDON, W1H 6LL | £460,000 | 12/06/2009 | Flat |

## Sold Comparables

*Same street and nearby sales within 0.25 miles. Data from Land Registry Price Paid. Last 5 years.*

| Address | Price | Date | Type |
|---------|-------|------|------|
| 15 FLAT 54 PORTMAN SQUARE, LONDON, CITY OF WESTMINSTER, GREATER LONDON, W1H 6LJ | £2,100,000 | 11/07/2025 | Flat |
| [Same street] 15 FLAT 89 PORTMAN SQUARE, LONDON, CITY OF WESTMINSTER, GREATER LONDON, W1H 6LL | £1,340,000 | 14/12/2023 | Flat |
| [Same street] 15 FLAT 96 PORTMAN SQUARE, LONDON, CITY OF WESTMINSTER, GREATER LONDON, W1H 6LL | £1,200,000 | 01/11/2023 | Flat |
| 15 FLAT 3 PORTMAN SQUARE, LONDON, CITY OF WESTMINSTER, GREATER LONDON, W1H 6LJ | £450,000 | 13/10/2023 | Flat |
| 15 FLAT 26 PORTMAN SQUARE, LONDON, CITY OF WESTMINSTER, GREATER LONDON, W1H 6LJ | £1,950,000 | 21/07/2023 | Flat |
| [Same street] 15 FLAT 72 PORTMAN SQUARE, LONDON, CITY OF WESTMINSTER, GREATER LONDON, W1H 6LL | £920,000 | 09/12/2022 | Flat |
| 15 FLAT 29 PORTMAN SQUARE, LONDON, CITY OF WESTMINSTER, GREATER LONDON, W1H 6LJ | £2,150,000 | 22/07/2022 | Flat |
| 15 FLAT 37 PORTMAN SQUARE, LONDON, CITY OF WESTMINSTER, GREATER LONDON, W1H 6LJ | £2,000,000 | 01/07/2022 | Flat |
| FITZHARDINGE HOUSE FLAT 57 PORTMAN SQUARE, LONDON, CITY OF WESTMINSTER, GREATER LONDON, W1H 6LH | £507,000 | 04/03/2022 | Flat |
| 30 APARTMENT 8 PORTMAN CLOSE, LONDON, CITY OF WESTMINSTER, GREATER LONDON, W1H 6DB | £3,700,000 | 15/12/2021 | Flat |
| FITZHARDINGE HOUSE FLAT 2 PORTMAN SQUARE, LONDON, CITY OF WESTMINSTER, GREATER LONDON, W1H 6LQ | £1,725,000 | 30/09/2021 | Flat |
| [Same street] 15 FLAT 67 PORTMAN SQUARE, LONDON, CITY OF WESTMINSTER, GREATER LONDON, W1H 6LL | £1,700,000 | 20/07/2021 | Flat |

**Street average:** £1,290,000 (4 sales)
**Area average:** £1,822,750 (8 sales)

## Price vs local average

*Outcode + property type (HousePrices, last 2 years).*

- **Local average:** £1,848,077 (13 Flat, W1H, 2024–2026)
- **Deviation:** -71.6%

## Rental Range

*ONS Price Index of Private Rents (Westminster). Low / Realistic / Optimistic = conservative / average / best case.*

- **Low:** £2,834/mo
- **Realistic:** £3,149/mo
- **Optimistic:** £3,464/mo

## LHA (Local Housing Allowance)

*VOA 30th percentile rent floor for Central London (Apr 2025 – Mar 2026).*

- **LHA floor (this property size):** £1,436/mo

## Rental Comparables

*Residential lets from OpenRent and Rightmove for the area (same bedroom count). Use to validate rent estimates. Student lets are excluded.*

| Title | Rent | Beds | Distance | As seen on |
|------|------|------|------|------|
| 1 Bed Flat, Mandeville Place, W1U | £3,750/mo | 1 | 0.21 miles | OpenRent |

**Average rent: £3,750/mo (1 listing)**

## 1% Rule

- **Rent ratio:** 0.71% (weak for cashflow)
- **Max investor price (0.8%):** £468,750
- **Target investor price (1%):** £375,000

*Monthly rent ÷ price. 1%+ = strong, 0.8–1% = okay, <0.8% = weak. Max investor price = rent ÷ 0.8% (Stoke-style target). Target investor price = rent ÷ 1% (strong cashflow band). Based on OpenRent comparables.*

## Rent-driven metrics

*Based on OpenRent comparables (median £3,750/mo).*

- **Gross yield:** 8.6%
- **Cost-to-rent:** 11.7×
- **Monthly cashflow:** £1,282/mo (75% LTV, 3.95% APR (5yr fixed), 25yr term)
- **Cash-on-cash ROI:** 10.1%

*Gross yield = annual rent as % of price (no costs). Cost-to-rent = price ÷ annual rent (from OpenRent comparables); under 14× = strong, 14–16× = acceptable, 17×+ = compressed. Cashflow = rent − mortgage − 10% maintenance − £25/mo compliance; assumes 75% LTV, 3.95% APR (5yr fixed), 25yr term. ROI = annual profit ÷ cash in (deposit + 4% purchase costs).*

## Price per Square Metre

- **£/m²:** £8,468/m²

## Capital growth trend

*Land Registry outcode average from sold prices: last 12 months vs 5y and 10y ago.*

- **5y growth:** -11.3%
- **10y growth:** -42.3%

## House Price Index (HM Land Registry)

*Official index for City of Westminster; Flats and maisonettes series; as of March 2026.*

- **1y growth (index):** -12%
- **5y growth (index):** -21.6%
- **10y growth (index):** -19.6%

## Flood risk

- **Zone:** 1
- **Risk:** Low
- **Source:** Job (default Low)

[Check long-term flood risk (GOV.UK)](https://check-long-term-flood-risk.service.gov.uk/postcode)

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Property details

Tenure

LEASEHOLD (53 years remaining on lease)

Floor area

62 m²

EPC rating

Year built

England and Wales: before 1900

Last sold

£600,000 Feb 2010

Price per m²

£8,468/m²

Local average

£1,848,077 (-71.6%)

Deprivation

Decile 8 (26,473 of 33,755)

Street crime

3184 incidents within 1 mile (Apr 2026)

Key features

wooden floors
contemporary style
24 hour porterage
passenger lift

Additional details

Garden: Yes

Description

Listed by

London

Park Lane Apartments Ltd

Reference: 24278195

EPC Rating & Upgrade Cost

Current rating: B

Potential rating: B

Inspection date: 26/06/2024

Expiry date: 25/06/2034

Est. upgrade cost to C: £9,100

Recommendations

50 mm internal or external wall insulation (£4,000 - £14,000)
Draughtproof single-glazed windows (£80 - £120)

View full EPC on gov.uk

Flood risk

Zone: 1

Risk: Low

Job (default Low)

Price history

30% since 2009

Event	Date	Price	% change
Sold	23/02/2010 (16 years ago)	£600,000	+30.4%
Sold	12/06/2009 (17 years ago)	£460,000	—

Source: HM Land Registry Price Paid Data. Crown copyright.

Sold Comparables

Same street and nearby sales within 0.25 miles (last 5 years). Data from Land Registry Price Paid.

Address	Price	Date	Type
15 FLAT 54 PORTMAN SQUARE, LONDON, CITY OF WESTMINSTER, GREATER LONDON, W1H 6LJ	£2,100,000	11/07/2025	Flat
Same street 15 FLAT 89 PORTMAN SQUARE, LONDON, CITY OF WESTMINSTER, GREATER LONDON, W1H 6LL	£1,340,000	14/12/2023	Flat
Same street 15 FLAT 96 PORTMAN SQUARE, LONDON, CITY OF WESTMINSTER, GREATER LONDON, W1H 6LL	£1,200,000	01/11/2023	Flat
15 FLAT 3 PORTMAN SQUARE, LONDON, CITY OF WESTMINSTER, GREATER LONDON, W1H 6LJ	£450,000	13/10/2023	Flat
15 FLAT 26 PORTMAN SQUARE, LONDON, CITY OF WESTMINSTER, GREATER LONDON, W1H 6LJ	£1,950,000	21/07/2023	Flat
Same street 15 FLAT 72 PORTMAN SQUARE, LONDON, CITY OF WESTMINSTER, GREATER LONDON, W1H 6LL	£920,000	09/12/2022	Flat
15 FLAT 29 PORTMAN SQUARE, LONDON, CITY OF WESTMINSTER, GREATER LONDON, W1H 6LJ	£2,150,000	22/07/2022	Flat
15 FLAT 37 PORTMAN SQUARE, LONDON, CITY OF WESTMINSTER, GREATER LONDON, W1H 6LJ	£2,000,000	01/07/2022	Flat
FITZHARDINGE HOUSE FLAT 57 PORTMAN SQUARE, LONDON, CITY OF WESTMINSTER, GREATER LONDON, W1H 6LH	£507,000	04/03/2022	Flat
30 APARTMENT 8 PORTMAN CLOSE, LONDON, CITY OF WESTMINSTER, GREATER LONDON, W1H 6DB	£3,700,000	15/12/2021	Flat
FITZHARDINGE HOUSE FLAT 2 PORTMAN SQUARE, LONDON, CITY OF WESTMINSTER, GREATER LONDON, W1H 6LQ	£1,725,000	30/09/2021	Flat
Same street 15 FLAT 67 PORTMAN SQUARE, LONDON, CITY OF WESTMINSTER, GREATER LONDON, W1H 6LL	£1,700,000	20/07/2021	Flat

Street average: £1,290,000 (4 sales)

Area average: £1,822,750 (8 sales)

Capital growth trend

Land Registry outcode average: last 12 months vs 5y and 10y ago (from sold prices).

5y growth -11.3%

10y growth -42.3%

House Price Index (HM Land Registry — official index, not sold-price averages): City of Westminster. Series: Flats and maisonettes. As of March 2026.

1y (index) -12%

5y (index) -21.6%

10y (index) -19.6%

Company ownership

Registered legal owner is a company.

Company-owned (UK company) Company-owned (Overseas company)

Company: WILLOWGREEN PORTMAN SQUARE LIMITED (2247192)

Rental Range

Estimated market rent for Westminster. Low = conservative, Realistic = average, Optimistic = best case.

Low £2,834/mo

Realistic £3,149/mo

Optimistic £3,464/mo

Based on Local Authority from postcode lookup → Westminster.

LHA (30th percentile) floor for Central London: £1,436/mo (Apr 2025 – Mar 2026)

Location

Map view View on Google Maps View on OpenStreetMap Street View W1H 6LL

Nearby

Nearest stations, universities and amenities (distance from property).

Type	Name	Distance
Shop	Sharps	0.0 miles
Shop	Back in Action	0.1 miles
Bus stop	Portman Square	0.1 miles
Bus stop	George Street	0.1 miles
Train station	Marble Arch	0.2 miles
Train station	Bond Street	0.3 miles
University	LBS Behaviour Lab	0.7 miles
Hospital	The Portland Hospital	0.7 miles
Hospital	National Hospital for Neurology and Neurosurgery at Cleveland Street	0.8 miles
University	Department of Geography	1.1 miles

Street-level crime

Category	Count
Theft from the person	693
Other theft	561
Shoplifting	429
Anti-social behaviour	397
Violence and sexual offences	370
Drugs	220
Public order	106
Robbery	105
Burglary	94
Vehicle crime	75
Criminal damage and arson	57
Bicycle theft	40
Other crime	19
Possession of weapons	18
Total incidents	3184

Within 1 mile during Apr 2026. Source: data.police.uk (England & Wales).

Schools nearby

Nearest open schools with Ofsted ratings (England). Closed schools are not shown. Data from Get Information about Schools and Ofsted.

Name	Type	Distance	Ofsted
St Vincent's Catholic Primary School	Primary	0.2 miles	Outstanding — 4 Feb 2024
Wetherby Preparatory School	Other	0.2 miles	— (No rating)
Halcyon London International School	Other	0.3 miles	Outstanding — 27 May 2020
Wetherby Senior School	Other	0.3 miles	— (No rating)
Sylvia Young Theatre School	Other	0.3 miles	— (No rating)

Rental Comparables

Residential lets from OpenRent and Rightmove for the area (same bedroom count). Use to validate rent estimates. Student lets are excluded.

Title	Rent	Beds	Distance	As seen on
1 Bed Flat, Mandeville Place, W1U	£3,750/mo	1	0.21 miles	OpenRent

Average rent: £3,750/mo (1 listing)

Rent-driven metrics

Based on OpenRent comparables.

Rent ratio 0.71%

Max investor price (0.8%) £468,750

Target investor price (1%) £375,000

Gross yield 8.6%

Cost-to-rent ratio 11.7×

Monthly cashflow £1,282/mo 75% LTV, 3.95% APR (5yr fixed), 25yr term

Cash-on-cash ROI 10.1%

Rent ratio — Monthly rent ÷ purchase price (1% rule). 1%+ = strong, 0.8–1% = okay, <0.8% = weak for cashflow.
Max investor price — Rent ÷ 0.8%; the price at which rent would be 0.8% of price (Stoke-style target).
Target investor price — Rent ÷ 1%; the price at which rent would be 1% of price (strong cashflow band).
Gross yield — Annual rent as % of purchase price (no costs).
Cost-to-rent — Price ÷ annual rent (from OpenRent comparables). Under 14× = strong, 14–16× = acceptable, 17×+ = compressed.
Cashflow — Rent minus mortgage, 10% maintenance, £25/mo compliance. Assumes 75% LTV, 3.95% APR (5yr fixed), 25yr term.
ROI — Annual profit ÷ cash in (deposit + 4% purchase costs).